Window frame extrusion



FIG. 1 is a perspective view of a window frame extrusion showing our new design; and,

FIG. 2 is an end elevational view thereof.

The broken lines shown in FIGS. 1 and 2 illustrate portions of the window frame extrusion that form no part of the claimed design.

The window frame extrusion is shown with a symbolic break in its length. The appearance of any portion of the window frame extrusion between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a window frame extrusion, as shown and described. 